We sent you sample 12 pcs. Pls note that the tensile strength after welding should not lower than 14.27 kg/2mm. Cust get competitor machine and need to weld 10 times to get such tensile strength. We kindly request you to weld & test the tensile strength to reach this tensile strength. If we can weld less than 10 times continuously then will be our advantage. Pls send us back few pcs. of sample and tensile strength testing report.